Light of wavelength 3000 Å falls on a se...

Light of wavelength 3000 `Å` falls on a sensitive surface. If the surface has received `10^-7` J of energy, then the number of photons falling on the surface area is

`5 xx 10^(11)`

`2.5 xx 10^(11)`

`3 xx 10^(11)`

None of these

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